On Wed, 22 Mar 2006 20:09:27 +0000, garden-addicted
wrote:


I have been running that heater for a while now and using a min max
thermometer the green house has never dropped below 5 degrees and
hadn't risen above 10 degrees until recently.

So I am confident in the 3kw parasene heater to keep the frost out of
my greenhouse.

We also have an 80ft by 30ft greenhouse and we use commercial heaters
mounted on the ceiling. These are set to 15 degrees and they run until
the temp is about 20 degrees until it turns off and then possibly
doesn't come on until under 15 degrees. If it was to switch on and off
at 15 degrees it would be going on and off all the time.

In fact if its running at 15 degrees I can turn the controller down to
10 degrees before it switches off and then turn it straight back to 15
degrees and it doesn't come back on for a while.


Mine behaves similarly, but sorry, that's not what I regard as good
control. Whilest I accept there has to be an interval between 'off'
and 'on', that's way too much for my liking. If I want to control my
g/h or whatever to a minimum of 10C, I don't want it going all the way
up to 15C as it's a waste of electricity. Our domestic central heating
thermostat switches in and out over 1C, and I've had g/h heaters in
the past that achieved a range of about 2C. OK, so they may switch
more frequently, but I see no problem with that: it's what the
thermostat's for.


--
Chris

E-mail: christopher[dot]hogg[at]virgin[dot]net

I have since replaced my Parasene 3KW heater for a Green Bio Arazona
jobbie - much more efficient.
However, my past experience was that the thermostat on the Parasene was too
erratic for me so I put a thermostatic plug in the socket & wound the
thermostat up to full.
Temperature variation was a lot better using this process.

SH

"Chris Hogg" wrote in message
...
On Wed, 22 Mar 2006 20:09:27 +0000, garden-addicted
wrote:


I have been running that heater for a while now and using a min max
thermometer the green house has never dropped below 5 degrees and
hadn't risen above 10 degrees until recently.

So I am confident in the 3kw parasene heater to keep the frost out of
my greenhouse.

We also have an 80ft by 30ft greenhouse and we use commercial heaters
mounted on the ceiling. These are set to 15 degrees and they run until
the temp is about 20 degrees until it turns off and then possibly
doesn't come on until under 15 degrees. If it was to switch on and off
at 15 degrees it would be going on and off all the time.

In fact if its running at 15 degrees I can turn the controller down to
10 degrees before it switches off and then turn it straight back to 15
degrees and it doesn't come back on for a while.


Mine behaves similarly, but sorry, that's not what I regard as good
control. Whilest I accept there has to be an interval between 'off'
and 'on', that's way too much for my liking. If I want to control my
g/h or whatever to a minimum of 10C, I don't want it going all the way
up to 15C as it's a waste of electricity. Our domestic central heating
thermostat switches in and out over 1C, and I've had g/h heaters in
the past that achieved a range of about 2C. OK, so they may switch
more frequently, but I see no problem with that: it's what the
thermostat's for.


--
Chris

E-mail: christopher[dot]hogg[at]virgin[dot]net

In message , Springtime
wrote

I have since replaced my Parasene 3KW heater for a Green Bio Arazona
jobbie - much more efficient.

No form of electric heating can be efficient. It may be more convenient
or easier to install but it isn't the cheapest to run.

You don't see pubs with outdoor electric patio heaters.

--
Alan
news2006 {at} amac {dot} f2s {dot} com

I bow to your superior knowledge.
However my comment related to the comparison between the two units and yes
the Bio Green Arizona is more efficient than the Parasene 3KW fan heater..
The reason for choosing the heating type for a greenhouse can be many fold
from the ability to lug cans of paraffin or huge bottles of propane gas to
the cost/feasibility of installing electricity or natural gas etc.
Similarly, the means of heating may have to be totally reliable & have
accurate thermostatic control because the gardener may not be home every day
to check.
At the end of the day we make our choices based upon a balance of cost,
effectiveness & convenience.

SH

"Alan" wrote in message
news
In message , Springtime
wrote

I have since replaced my Parasene 3KW heater for a Green Bio Arazona
jobbie - much more efficient.

No form of electric heating can be efficient. It may be more convenient or
easier to install but it isn't the cheapest to run.

You don't see pubs with outdoor electric patio heaters.

--
Alan
news2006 {at} amac {dot} f2s {dot} com